Institute for Astronomy and Astrophysics

Tübingen NLTE Model-Atmosphere Fluxes

We provide here grids of NLTE stellar model atmosphere fluxes which, cover the parameter range of planetary nebula (PN) with hot central stars (CSPN): Teff = 50 - 190 kK, log g = 5 - 9 (cm/sec2). Partly tables for a specific chemical composition are more/less extended.
These fluxes may be used e.g. as ionizing spectra in PN modeling.

The user of these model-atmosphere fluxes should be aware that they should only be used in a PN analysis if the central star's abundances are in agreement with the model abundances. The use of fluxes from models with solar abundance ratios will spoil any PN analysis if the exciting star is hydrogen deficient!

Please do not hesitate to contact us directly.

Description of the grids
name chemical composition date of release comment
H pure H May 2007 Teff = 20 - 1000 kK
log g = 4 - 9 (cm/sec2)
He pure He Jun 2004 Teff = 50 - 190 kK
log g = 5 - 9 (cm/sec2)
H+He H+He Aug 2004 abundance ratios:
He:H = 10-9, 0.1, 0.2, ..., 0.9, 109
by mass
H+He 0.605 H+He Mar 2001 models following an evolutionary track of a post-AGB star with 0.605Msun core mass
H-Ca all elements from H to Ca May 2001
H-Ni all elements from H to Ni Nov 2002
He+C+N+O He+C+N+O Jan 2006 abundance ratios:
He:C:N:O=33:50:2:15
by mass
H+He+C+N+O+Ne+Mg+Si+S+Ca-Ni H+He+C+N+O+Ne+Mg+Si+S+Ca-Ni Jul 2010 abundance ratios:
see table (follow link)

The H-Ca and H-Ni grids give stellar model atmosphere fluxes for solar and halo abundance ratios.

The first generation (H-Ca) includes the opacities of the light metals.

The second generation (H-Ni) includes detailed Ca as well as iron-group (Sc+Ti+V+Cr+Mn+Fe+Co+Ni) opacities (with millions of lines following